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TLSubmission 2004-10-0973 <br /> i Gas/BTEXIMTBE by 8260B <br /> SECOR-Sacramento <br /> Attn Amy Draffan <br /> 3017 Kilgore Road, Suite 100 <br /> Rancho Cordova, CA 95670 <br /> Phone (916) 861-0400 Fax (916)861-0430 <br /> Project 77CP 60004 01 6981 Received 10/29/2004 14 50 <br /> Conoco Phipps Site#6981 <br /> Site 4707 Pacific Ave , Stockton, CA <br /> Batch QC Report <br /> Prep(s) 5030B Test(s) 8260E <br /> Laboratory Control Spike Water QC Batch #2004/11105-2E 68 <br /> LCS 2004111105-2E 68-008 Extracted 11/05/2004 Analyzed 11/05/2004 19 08 <br /> LCSD <br /> Compound Conc ug/L Exp Conc Recovery% RPD Ctrl Limits% Flags <br /> LCS LCSD LCS I LCSD % Rec RPD LCS LCSD <br /> Methyl tent-butyl ether(MTBE) 245 25 980 65-165 20 <br /> Benzene 245 25 98 0 69-129 20 <br /> Toluene 229 25 91 6 70-130 20 <br /> Surrogates(s) <br /> 1,2-Dichloroethane-d4 516 500 1032 72-128 <br /> Toluene-d8 509 500 1101 8 1 80-113 <br /> Severn Trent Laboratories, Inc 11/11120041545 <br /> STL San Francisco• 1220 Quarry Lane Pleasanton,CA 94566 <br /> A part M Severn Trent Plc Tel 925 484 1919 Fax 925484 1096'www stl-inc com*CA DHS EIRP#2496 Page 4 of 6 <br />